New service

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nickelec

Senior Member
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Good afternoon I just wanted to put this out there to back up my own design and thoughts

Existing service consists of 150 amp single phase main with 8 meters six residential units One commercial unit and one public lighting panel currently all single phase

My plan for upgrade is one new 400 amp three phase incoming main disconnect which would also be my service switch

On the load side of the service which I plan to put a triple lug on each face to feed free individual loads


One would be 150 amp single phase disconnect and panel which is existing

One three phase 200 amp feeder for a six gang meter stack

And one three-phase 100 and feeder for the public lighting panel

I guess my only concern is feeding the existing single phase disconnect and panel off of my main three-phase 400 amp switch I'm pretty sure there's no issues with that just wanted to clarify


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Some things come to mind:

The meter stack would need 200 amp overcurrent protection ahead of it for the tap conductor protection.

I would just be mindful of the tap rules for the 100 amp feeder. Depending on the location of the taps (outside/inside) and distance (if over 10 feet) you might have to upsize the 100 amp conductors

Equipment grounds (if the wire type) base off the 400 amp service switch.

No "next size up rule" for tap conductors

Joe
 
Agreed I forgot to mention all taps will have over current protection. I was more concerned about the triple lug on load side of service switch as opposed to tapping in a trough or gutter etc.

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Three phase 120/208? Existing is 120/240,
Will the 240 v appliances work at 208? Most will, and will not have the same watts. But there may be some that are only listed at 240 V
 
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